Search

In order to study the radiation energy distribution of laser pulse width after impact electron, the method of simulation calculation was adopted. Based on Lorentz equation and electron radiation equation, a single electron model of compact focusing laser acting on static single electron was established. The distribution of electron radiation energy produced by laser pulse and electron action under different pulse width was simulated by MATLAB software. The pulse width of femtosecond compact focusing elliptic polarization laser pulse and the peak radiation power between electrons were studied. The simulation results show that when the compact focused laser pulse encounters a stationary single electron, the electron radiates while the laser pulse hits the electron. The scattering radiation accumulates in a sharp cone at the center of the scattering direction. With the increase of laser pulse width, the distribution of radiation power gradually presents a double peak. The wider the pulse width, the smaller the peak value of electron radiation power. When the pulse width is 10λ0, the peak power is only 1% of that when the pulse width is 0.1λ0, and the initial pulse width is λ0 = 3. 33fs. At the same time, the wider the pulse width, the smaller the peak value of the electronic radiation power, the longer the required realization of the peak radiation power, the longer the duration of the peak, the lower the cut-off frequency of the spectrum function, the less high frequency components, and the increase of the harmonic frequency. The results are of great significance to the diagnosis of laser air plasma. [ABSTRACT FROM AUTHOR]

In order to study the relationship between the radiation of high-energy electrons and the electron's initial position, a scattering model of a single high-energy electron interacting with a Gaussian laser pulse was constructed according to the Lagrange's equation. And the method of numerical simulation was adopted to obtain the trajectory of the electron and the spatial radiation characteristics of the scattered light by MATLAB. The influence of the initial position of the electron on the space energy radiation was discussed in detail. The results show that the initially static high-energy electron first oscillates in the +z direction in a plane, and then travels along a straight line after interacting with the linearly polarized tightly focused intense laser. Both the maximum radiated energy and its corresponding radiation direction are greatly affected by the electron's initial position, while a peak value of the former exists as the initial position of the electron moves to the positive direction of z axis, and the azimuth angle of the latter stays unchanged while the polar angle gradually decreasing but finally stabilizing. The maximum radiation energy in the whole space is obtained when the electron is initially set at (0,0, -7λ0) (λ0 is the wavelength of the laser) with the polar angle and the azimuth angle being 23.5° and 180°, respectively. The research indicates that the highest possible intensity of radiation can be obtained by setting the electron' s initial location reasonably. [ABSTRACT FROM AUTHOR]

Based on the scalar diffraction theory, the propagation and focusing properties of a hard-edged diffracted beam generated by a Gaussian mirror resonator were investigated. Explicit expressions for the field distribution of the truncated beam that propagates through a paraxial optical ABCD system were derived in detail. Numerical examples are given to illustrate our analytical results. OCIS codes: 050.1960, 140.3300, 050.1220, 000.4430.

The far-field intensity distribution (FFID) of a beam generated by a phase-unifying mirror resonator was investigated based on scalar diffraction theory. Attention was paid to the parameters, such as obscuration ratio and reflectivity of the phase-unifying mirror, that determine the FFID. All analyses were limited to the [TEM.sub.00], fundamental mode. OCIS codes: 000.4430, 140.3300. 140.4780, 260.1960, 350.5500.